Hp probook 4520s laptop on but only hp welcome screen shows

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Registration date
Thursday October 11, 2012
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October 11, 2012
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Hello,




i hv HP Probook 4520s laptop since last 2 years.

just one week ago when i started my lappy, then it shows only hp screen.
it not started windows.
and also no keys, cd drive and pen drive working.
it only starts nothing else.

what is the problem with my lappy?
and what should i do?